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Old 10-26-2010, 07:44 PM
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400 sbc

what is the easiest way to tell if your 400 sbc has steam holes in the stock heads because im wanting to rebuild my top end and i was goin to buy new aluminum heads and the ones that i want to get dont have the steam holes in them.
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Old 10-26-2010, 08:09 PM
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Your going to have them off for the re-build right? Flip them over and look at them. Should be like two between each of the cylinders.



Cole
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Old 10-26-2010, 08:34 PM
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http://www.gregsengine.com/convertin...ds-to-400.html
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Old 10-26-2010, 08:45 PM
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Dang it Richard that's where i got my pics for reference.



Cole
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Old 10-26-2010, 08:55 PM
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All aftermarket heads will need to have the steam holes drilled in them by you, unless they already have them drilled by the manufacturer. Some do, most don't, and some companies will do it for you if you ask when you order them.

All stock 400 heads have the holes from the factory. If you take a stock 400 engine apart and they aren't there, someone has swapped the heads at some point.
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Old 10-26-2010, 08:58 PM
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Some people will argue with you that the steam holes are not necessary and that may be true on a racing motor that will keep the revs up and keep things moving in the water jacket. But the engineers designed the holes to be there for low speed engine operation, where there is insufficient water speed and turbulence to wash out the corner hot spot that forms there. When in doubt, drill 'em out.
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Old 10-26-2010, 09:00 PM
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Dang it Richard that's where i got my pics for reference. Cole
Sorry Cole.
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Old 10-26-2010, 10:18 PM
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Yes I have to agree completely with techinspector1. All stock 400 sbc had steam holes and if changing heads drill them in.
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Old 10-26-2010, 10:37 PM
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Heads are the biggest bang for the buck

You might want to try Vortec heads. On a 400 they will work very well. Running a stock cam +engine they will add 50-60 hp/ 15 ft of torque.

Good units are still avalible before the winter. Now is the best time for hunting. While you are there grab some BEEHIVE GM 3100 V6 springs and retainers.

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Old 10-27-2010, 05:51 PM
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im goin to be putting in a edelbrock performer RPM hydraulic roller cam, E-tec heads, Vortec Performer RPM Air Gap, high-end pushrods, aluminum roller rockers, and hydraulic roller lifters.
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